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Proceedings of the International Plant Propagator's Society

Vol. 50

Relation between Nitrogen Status, Carbohydrate Distribution, and Subsequent Rooting of Chrysanthemum Cuttings

Uwe Druege, Siegfried Zerche and Roland Kadner

pp: 228-238


Adventitious root formation (ARF) of cuttings is substantially affected by the initial nitrogen and carbohydrate status (Haissig, 1986; Blazich, 1988; Veierskov, 1988). High nitrogen supply to stock plants, meeting or even surpassing the level necessary for maximum growth, has often been observed to decrease subsequent rooting of cuttings (Roeber and Reuther, 1982; Haissig, 1986; Henry et al., 1992). Such effects have been discussed repeatedly in relation to decreased carbohydrate levels and decreased C : N ratio, which was first suggested by Kraus and Kraybill (1918) to be a crucial characteristic for ARF. However, there exists a large amount of conflicting data (Hansen et al., 1978; Leakey, 1983; Haissig, 1986; Veierskov, 1988; Leakey and Storeton-West, 1992). In a recent study, ARF of chrysanthemum cuttings at natural radiation in a greenhouse during spring and summer was found to be positively correlated with initial nitrogen concentrations, and not impeded by

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